Teleprinter unit



April 7, 1942. c. J. FITCH ET AL 2,278,981

Y TELEPRINTER UNIT Filed Dec. 18, 1940 2 Sheet s-Sheet 1 FIGJ.

I g gm TORS B Y ATTORNEY April 7, 194? c. J. FITC'H Em. 2,278,981

TELEPRINTER UNIT Filed D90. 1 8, 1940 V 2 Sheets-Sheet 2 HM FIG.2.

.sig/za/ [Jae A I j Q INV o 5 A T TORNE Y Patented Apr. 7, 1942TELEPRINTER UNIT Clyde J Fitch, Endwell, and Kurt R. Schneider,

Endicott, N. Y., assignor s to International Business MachinesCorporation, New York, N. Y., a corporation of New York ApplicationDecember 18, 1940, Serial No. 370,677

4 Claims. (Cl. 178-33) This invention relates to teleprinter units, andmore particularly to such units for use as a receiving or recordingdevice, in remote control systems, such as, printing telegraph systemsand the like. A suitable system employingthe present unit is describedin co-pending application Serial No. 370,675, filed Dec. 18, 1940.

The present invention constitutesan improvement of the receiving unit,described in U. S. Patent No. 2,165,247, which unit comprises aplurality of rotatable permutation members, which are released, uponsuccessive energizations of the control magnets, in combinations,corresponding to the code groups of impulses impressed upon the saidmagnets, thereby effecting selection of predetermined character typeelements.

It has been found, that in certain types of printing telegraph systems,the timed impulses are received, at too slow a rate, for effectingproper control of the unit referred to, therefore, in the presentapplication, it is suggested, to store the received impulses directly inthe unit, until all the impulses of the code groups are received. Uponreceipt thereof, an additional control magnet, termed the print magnetis provided I to release the permutation members, simultaneously, toeffect the character selection.

Therefore, one of the objects of the present invention resides in theprovision of storage means associated with the individual permutationmembers for storing the received signals of the code groups.

Another ,object of the present invention resides in the provision ofadditional control means for releasing the permutation members,simultaneously, in accordance with the stored signals. Other objects ofthe invention willbe pointed out in the following description and claimsand illustrated in the accompanying drawings, which, disclose, by way ofexample, the principle of the invention and the best mode, which hasbeen contemplated, of applying that principle.

In the drawings:

Fig. 1 is a plan view, partially in section of the. 45

In this manner, the dog I02 is held in a position, so that its tooth isprevented from engaging the,

dog lifting lever Of the clutch unit.

Fig. 4 is a wiring diagram showing the schematic circuit connections ofa receiving system employing the teleprinter unit.

In certain types of printing telegraph systems the timed signals areinitiated and, transmitted at too low a frequency rate, and consequentlythe timed signals are received at too slow a rate to. operatesatisfactorily the printer unit referred to in U. S. Patent No.2,165,247. To overcome this condition, certain modifications of thestructural details of this unit have been suggested, whereby thereceived signals are stored by the control clutchunits associated withthe permutation bars. Upon receipt of the signals of each combination, aprint control magnet is energized to effect the selection of thecharacter type elements and recording of the characters. reference nowto Figs. 1-3, and 3a, the changes referred to will be described. 7

The rotatable permutation bars I00, of which six are shown, are providedwith individual clutch. units, comprising an annular member IOI, securedto a related bar, which member is shaped to receive a movable dog I02.

out of engagement with the associated ratchet wheel 104. A pivoted doglift lever I05 is provided to control the positioning of the dog, and

" cated by the reference character I08, aredriven to effect continuousrotation of the individual gears I09, and the related stud shafts I III,which shafts in turn causethe rotation-of the associated ratchet wheelsI04.

Referring now to the dog lift lever I05, it is noted, that twoindividual stops II I and H2 are formed thereon, and arranged onebelcwthe other in offset positions with respect to each other.

H3 in one side thereof, so thatthe uppermost section I I4 of the stoparm can engage the upper stop III of the dog lift lever. I05, wheneverthe armature I0! is in a released position as shown.

associated rotating wheel, and consequently, pre-,

venting the associated permutation bar from be.

ing rotated or operated.

. Now, upon energization of the related control magnet, for examplemagnet MI, the stop arm I06, as viewed in Fig. 3, is partially rotatedin a.

clockwise direction, thereby resulting in the disengagement of the stopsection H4 and upper With I The said dog is, provided with a singletooth I 03 normally held.

The upright section of the cooperating stop arm I06 is provided withaU-shaped slot stop II I of the dog lift lever, and the engagement of thesaid stop section with the lower stop H2 of the dog lift lever. Thisresultant action is quite similar to actions of well known escapementmechanisms. The escapement action is positive, due to the fact, that thedog 102 is constantly urged, by spring means (not shown in the presentapplication but described in detail in the Patent 2,165,247), in thedirection of the ratchet wheel. The stop arm I06 is retained in theshifted position, by means of a frictional lock, comprising the springurgedball H 5 engaging the uppermostnotch H6 formed in the side.opposite the one-with the slot' [13 of the upright section of stoparm.

ance with the code signals impressed upon the control magnets MIM6.

While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to a single modification itwill be understood that various omissions and substitutions and changesin the form and details of the device illustrated andgin its operationmay be made by those skilled in the art, without departing from thespirit of the invention. It is the intention, therefore, to belimited'only as indicated by the scope of the fol- Q lowingclaims.

It is evident now, that, as the control signals are impressed upon theindividual magnets Ml-MS to effect energization thereof, the saidsignals are effective to cause the controlled clutch units to be shiftedas described, and store the corresponding signals until the clutch unitsare released completely to effect rotation of the related permutationbars. A diagrammatic show ing of suitable signal receiving means. isshown in Fig. 4, wherein the reference character 'l2l designatesgenerally a receiving distributor, either of. the start-stop orcontinuously operated type. The code groups of impulses are impressedupon magnets MIM6', successively, by means of the rotating brushes I22,to cause these timed impulses to be stored by the said clutch units. Theprint magnet MP is energized, by means of the local power source I23,upon receipt of all the impulses of each code group.

The release of each clutch unit is under control of the print magnetsMP, only one ofwhich is shown, however it will be understood, thatv oneprint magnet is provided for each group of three control magnetsincluded in the. printer unit. The said print magnet is mounted. below.the related group of control magnetaand is provided with a pivotedarmature I I! to which an extension arm 8 is. secured, there being anextension arm for each related control magnet. Thesaid extension armsare adapted to engage the 'displaced or shifted stop arms I06, uponenergization of the print magnet MP, to re: storethe said. arms torthenormal position shown. Upon restoration of a stop arm I06, theuppermostsection H4 thereof is disengaged from the lower stop H 2,.thereby releasing the dog lift lever H15. and. permitting ,the tooth ofthe dog 102 to,

engage the related ratchet wheel. This operation results in the rotation'of the, associated permutation bar. Upon completionjof a revolution ofthe bar and clutch unit, the upper stopf ill" of the dog lift leveragain engages the uppermost section 14 of the restored stop' arm, toefie'ct disengagement of the, said dog tooth and ratchet. Thus, it'isseen, that all the shifted clutch units are released, uponenergizati'onof the associated print magnet to effect rotation. of therelated permutation bars, after the different signals of the permutationcombi mations are receivedand stored. l i Each, permutation bar I00 isprovided with a What is claimed is:

1. A device of the character described controlled by variably timedgroups of signals comprising, in combination, a plurality of normallyinoperative rotatable permutation members, means capable of rotating thesaid members upon the release of the latter, a plurality of controlmembers, means to efi'ect selection of certain of the control membersduring the rotation of the permutation-members, control magnets, one foreach permutation member, means controlled by the magnets for storing thecode groups of signals, and means, efiective upon receipt of each groupof signals, for efiecting release of combinations of permutationmembers,

, simultaneously, in accordance with the stored signals.

2. A device of the character, described controlled by variably timedgroups of signals comprising, in' combination, a plurality of normallyinoperative rotatable permutation members,

continuously rotating driving means, clutch units, one for each member,each unit including signal storing means, control magnets, one for eachclutch unit, responsive to the received groups of signals, forcontrolling the storing means to effect storing of the received signals,and'meansfor controlling the clutcli units, upon receipt of each groupofsignals, to efiect con nection of combinations of members,simultanedrama the said driving means, inaccordance .45

with the'stored signals. ,5 v

3. A deviceof the character described controlled by variably timedgroups of signals comprising, in combination; a plurality of normallyinoperative rotatable permutation members,

mally inoperative'rotatable permutation memplurality of diametricallyopposed slots H9,

which bars upon rotation, in permutative groups, present'certain of thesaid slots under the controllevers I20, so that one control lever isserected, and permitted to drop in the channel provided by those slotswhich are in alignment.

The; selected control lever is theneffective to operateits attached keybar lever (not shown) ,to cause the character to berecorded, inaccordbers, means capable of rotating the said members' upon the releaseofthe latter, control magnets, one for each permutation member, and

individual means controlled by the said magnets for controllingtherelease of said members whereby the latter areyrotated by the firstmentioned means,'sa'id controlled means including signal storingfmensfor storing the received code grcupsof signals. V

- a v C Y -J: FITCH;

KURT R." SCHNEJDER'E

